The most reliable USB inserts I've found come from SCOSCHE, and pictured here is the USBC242M. I have tried & murdered many as well as lived vicariously through customers failed products too. The white colored Rayovac USB charger, used in this test, died shortly afterwards.
The SCOSCHE USBC242M is 12 Watts or 2.4A per port (24W - 4.8A total output) and is the one you'd want. The older model SCOSCHE was 2.1A per port.
I have ordered a fair number of the SCOSCHE USBC242M for customers and not yet had a single one fail. I believe I have approx 45 of these out there, in use, without a failure to date.
My family regularly charges two iPad Air's off just one USBC242M. We keep 4 of them on-board, three at the nav station and one in the v-berth. We also use them in each car.
Times are always changing and I am sure there are other reliable USB chargers out there now. Look for one that offers the ability to charge your product at "high speed" and can deliver at least 2.4A per USB port. Buying a well known name brand seems to mean squat in this product arena. Below are some of the USB charger failure brands I have seen.
USB Charger Failures:
Belkin RCA Griffin Technology Rayovac Anker Blue Sea (dual socket permanent mount) Duracell No Name USB = Lots
10:06 AM 2% SOC
My first screen shot is again at 2% SOC. It appears the screen won't even turn on until it says 2%.....
Data Point 2% SOC @ 10:06 AM = -0.01 Ah's
First data point via the Pentametric tracking software.
2:00 PM - 94% SOC
I got side tracked and finally came back when it was at 94% SOC...
Data Point 94% SOC @ 2:00 PM = -4.15 Ah's
Here is where the data begins to get interesting. It took just -4.15 Ah's to go from 0% - 94% SOC with the 12V adapter. This is looking very good at this point....
2:41 PM - 100% SOC
Sadly I missed the data print screen for 99% SOC, which occurred at 2:30 PM. It finally ticked over to 100% sometime between 2:40 & 2:41 PM as I was doing a quick screen check every minute after 99%..
Data Point 100% SOC @ 2:41 PM = -4.36 Ah's
As in many other observations one can easily see how much more efficient it is to remain DC throughout the entire charging process.
To go from 0% SOC to 100% SOC using straight DC>DC, as opposed to DC>AC>DC we saved 1.28 Ah's of energy (5.64 Ah - 4.36Ah = 1.28)!!!
Put another way when using the 400W inverter and Apple 120V adapter to charge this iPad it uses 29% more energy to for a complete charge cycle.
Total Charge Duration = 4:41
Total Energy Consumed = -4.36 Ah
Average Current = 0.8A -1.1A
So what's the bottom line?
If you want to charge as efficiently as possible, stay with DC!
Help Support This Site
Like what you saw or read in this article? Was it helpful? Could the information save you some money? Would you like to see more articles like this?
If so feel free to donate, support the site, and keep it growing. Please DO NOT feel obligated at all. If you like it and want to make a donation, please do. Your donations help keep the content coming and also help keep it FREE.
Click the DONATE button below if you would like to make a donation via PayPal.